Single-stage Three-phase Current-source Photovoltaic Grid-connected Inverter with High


A single-stage three-phase current-source photovoltaic (PV) grid-connected inverter with high voltage transmission ratio is proposed in this study (VTR). An improved zone sinusoidal pulsewidth modulation (SPWM) control approach is also introduced, as well as an active-clamped subcircuit that may decrease the energy storage switch's turn-off voltage spike. The VTR expression and design criterion of the center-tapped energy storage inductor, as well as the circuit architecture, control strategy, stable principle features, and high-frequency switching process, are all thoroughly examined. The upgraded zone SPWM control approach has two control loops: an outer loop for PV cell input dc voltage with maximum power point tracking and an inner loop for energy storage inductor current. Experiments on a 3-kW 96VDC/380V50Hz3AC prototype revealed that this type of three-phase inverter offers outstanding single-stage power conversion, high VTR and power density, and high conversion efficiency. Despite this, the PV cells have a tiny energy storage inductor and output CL filter, low output current total harmonic distortion, and a flexible voltage configuration. This research shows how to build a single-stage three-phase inverter with a high VTR using an effective design strategy.

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